never put off until tomorrow what you can do today
US /ˈnɛvər pʊt ɔf ənˈtɪl təˈmɑˌroʊ wʌt ju kæn du təˈdeɪ/
UK /ˈnɛvər pʊt ɔf ənˈtɪl təˈmɑˌroʊ wʌt ju kæn du təˈdeɪ/

1.
do not delay doing something if you can do it immediately
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I know you want to relax, but remember, never put off until tomorrow what you can do today.
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My grandmother always told me, 'Never put off until tomorrow what you can do today,' and it's a lesson I live by.